II. GENERAL SYSTEMATIC ACCOUNT OF THE GENERA, SPECIES, 

 AND VARIETIES FROM THE PACIFIC OCEAN. 



Erylidae. 



Tetraxonida with rhabd and teloclade megascleres, and a superficial armour 

 composed of aspidasters and microrhabds. Euasters are always present in the 

 choanosome. 



For the present I place only one genus, Erylus, in this family. 



ERYLUS Gray. 



With uniporal affercnts and uniporal efferents or larger oscules. Without 

 ana- or protriacnes. 



Twenty-two species are known. Eight of these occur in the Pacific Ocean. 



SUMMARY OF THE SPECIES FOUND IN THE PACIFIC OCEAN. 



Ai The large choanosomal euasters are oxyasters. 

 A2 The teloclades are orthoplagiotriaenes. 

 A3 The microrhabds have pointed ends. 



E. placenta Thiele. E. monticularis Kirkpatrick. 

 B3 The microrhabds are amphistrongyle centrotyles. 



E. decumbens Lindgren. . 

 B2 The teloclades are chiefly dichotriaenes. ; 

 E. oxyaster Lendenfeld. 

 Bi The large choanosomal euasters are acanthtylasters. 

 A2 The aspidasters are about twice as long as broad. 



E. nobilis Thiele. E. sollasii Lendenfeld. 

 B2 The aspidasters are nearly as broad as long. 



E. rotundus Lendenfeld, var. megarhabda Lendenfeld, var. typica 

 Lendenfeld, var. cidaris Lendenfeld. E. caliculatus Lendenfeld. 



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